Razorleaf PLM Tip - Defragmenting Virtual Machines
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Razorleaf PLM Tip - Defragmenting Virtual Machines

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Like Razorleaf, many PLM administrators use virtualization to power their test and development systems. When VM performance degrades, defragmenting virtual disks and virtual machines can help - but ...

Like Razorleaf, many PLM administrators use virtualization to power their test and development systems. When VM performance degrades, defragmenting virtual disks and virtual machines can help - but there are special steps to follow.

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Razorleaf PLM Tip - Defragmenting Virtual Machines Razorleaf PLM Tip - Defragmenting Virtual Machines Presentation Transcript

  • PLM Tip
    Defragmenting VMs
  • Why Fragmentation Slows Performance
    File writing, moving, and rewriting splits files over time (files go in the first available space)
    Seek time adds to overall retrieval time when reading from hard disks (seek increases when files are split)
    Compare:
    10msec read
    5msec read + 2msec seek + 3msec read + 2msec seek + 1msec read + 2msec seek + 1msec read (15msec)
  • How VM Fragmentation is Different
    VM Fragmentation
    Files fragmented across the virtual disk
    Virtual disk fragmented across multiple files
    Virtual disk files fragmented across physical disk
    versus
    Physical Fragmentation
    Files fragmented across the physical disk
  • Steps to Defragging VMs
    Defrag Guest OS (Defraggler on Guest)
    Defrag Virtual Disk (VMware Utility)
    Defrag Host OS (Defraggler on Host)
  • Defrag Guest OS
    Moves files into contiguous areas where possible, but may not move all guest files into a single virtual disk file
  • Defrag Virtual Disk
    Consolidates virtual files making up the disk, to the greatest extend possible
  • Defrag Host OS
    Moves virtual disk files into contiguous area
  • Useful Tools
    VM defrag
    (built-in with VMware)
    Defraggler
    Windows defrag
    Diskeeper